关键词: 操动机构, 控制阀, 参数化模型, 冲击特性

Abstract: Aiming at the problems exiting in high-speed and high-power three-stage valve hydraulic cylinder operating mechanism such as severe pressure fluctuation,high brake final velocity,high experimental costs and difficult acquisition of test parameters,an integrated modeling approach was applied to build the nonlinear dynamic models of three-stage valve and hydraulic cylinder considering complex main valve structure.This model was utilized for analyzing the displacement,velocity and impact pressure characteristics of actual valve-control hydraulic cylinder system.In addition,the relationship between parameters of piston (length,diameter,and initial gap),piston structure,peak pressure and final brake velocity was analyzed to assure reasonable value range and piston structure.Simulation results showed that piston structure and design parameters of hydraulic cylinder were the major factors affecting the peak pressure and high final brake velocity.The conical structure cylinder had obvious influence on lowering the pressure fluctuation and final brake velocity.

Key words: operating mechanism, control valve, parameterized model, impact characteristics